Digital photovoltaic alternating current combiner box

[0018] This embodiment:

[0019] The specific embodiments of the present invention will be described in further detail below in conjunction with the drawings and embodiments. The following examples are used to illustrate the present invention, but not to limit the scope of the present invention.

[0020] Such as figure 1 As shown, a digital photovoltaic AC combiner box includes an input circuit breaker, a surge protector SPD, an output circuit breaker QF, a three-phase digital multifunctional measurement and control meter PMC-33M, and an 8-channel switch value acquisition device ARTU-K8; The input circuit breaker and the surge protector SPD are electrically connected, and the output end of the surge protector SPD and the output circuit breaker QF are electrically connected. The three-phase digital multifunctional measurement and control meter PMC-33M and the 8-channel switch value acquisition device ARTU- K8 is connected in series, and a three-phase digital multi-function measurement and control meter PMC-33M and 8-channel switch value acquisition device ARTU-K8 are connected in parallel between the input circuit breaker and the output circuit breaker QF.

[0021] The input circuit breakers include a first input circuit breaker QF1, a second input circuit breaker QF2, a third input circuit breaker QF3, and a fourth input circuit breaker QF4, the first input circuit breaker QF1, the second input circuit breaker QF2, and the third input circuit breaker The output terminals of the input circuit breaker QF3 and the fourth input circuit breaker QF4 are connected through a three-phase line, the input terminal of the input circuit breaker is connected to the AC input, the output terminal of the input circuit breaker is connected to the surge protector SPD, between the input circuit breaker and the surge protector SPD A first fuse FU1 is provided, and the three-phase output terminal is connected with the output circuit breaker QF for protecting the circuit.

[0022] The three-phase digital multifunctional measurement and control meter PMC-33M includes a first three-phase current input terminal I1, a second three-phase current input terminal I3, and a three-phase voltage input terminal V; the first three-phase current input terminal I1 is connected to The first current transformer CT1 for phase current, the second three-phase current input terminal I3 is connected to the second current transformer CT2 for measuring three-phase current; the three-phase voltage input terminal V is connected to the three-phase line to form a three-phase Voltage input measurement line L1, three-phase voltage input measurement line L1 is provided with a second fuse FU2; 8-way switch value acquisition device ARTU-K8 includes control switch, first communication terminal A, second communication terminal B, and power supply positive terminal 2 and the negative terminal 1 of the power supply. The control switch respectively controls the on or off of the input circuit breaker, the output circuit breaker QF and the surge protector SPD. The three-phase digital multifunctional measurement and control meter PMC-33M is equipped with a connection for the first RS-485 communication terminal D of communication terminal A and second communication terminal B, three-phase digital multifunctional measurement and control meter PMC-33M is equipped with auxiliary power positive terminal L for connecting the positive terminal 2 of the power supply, three-phase digital multi-function The measurement and control electric meter PMC-33M is equipped with the auxiliary power negative terminal N for connecting the negative terminal 1 of the power supply. The positive terminal 2 of the power supply and the negative terminal 1 of the power supply are connected through the voltage transformer and the three-phase voltage input measuring line L1. The right side of the voltage transformer A third fuse FU3 is provided on the side.

[0023] The three-phase digital multi-function measurement and control meter PMC-33M and the 8-channel switch value acquisition device ARTU-K8 exchange data through the RS-485 bus. The AC input adopts four inputs and one output. The photovoltaic AC combiner box is installed on the AC output side of the inverter. And the grid connection point.

[0024] Refer to figure 1 This photovoltaic AC combiner box has four inputs and one output. The four AC inputs are summarized on the three-phase line. The input terminals are connected with four first input circuit breakers QF1, second input circuit breakers QF2, and second input circuit breakers for protecting the circuit. The three-input circuit breaker QF3 and the fourth input circuit breaker QF4 are connected to a surge protector SPD through the three-phase line to suppress the transient overvoltage from being lower than the equipment withstand impulse overvoltage, release the surge energy, and in low-voltage power distribution System and data signal lines prevent lightning surges and operation process voltage from intruding along the power line and signal line, and protect electrical equipment from damage. The three-phase output terminal is equipped with an output circuit breaker QF for protecting the circuit;

[0025] The first three-phase current input terminal I1 in the three-phase digital multi-function measurement and control meter PMC-33M includes two terminals I11 and I12. The two terminals I11 and I12 are respectively connected to the two ends of the first current transformer CT1; The phase current input terminal I3 includes two terminals I11 and I12. The two terminals I31 and I32 are respectively connected to the two ends of the second current transformer CT2, and the three-phase is measured through the first current transformer CT1 and the second current transformer CT2. For the current of each phase, the three-phase voltage input terminal V includes three terminals V1, V2, and V3. The three-phase voltage input measurement line L1 includes three lines L11, L12 and L13. One end of the three-phase voltage input measurement line L1 is connected to the three On the phase line, the other end of the three-phase voltage input measurement line L1 is connected to the three terminals of V1, V2 and V3 respectively for measuring the voltage of each phase of the three-phase; inside the three-phase digital multi-function measurement and control meter PMC-33M The positive terminal L of the auxiliary power supply is connected to the positive terminal 2 of the power supply on the 8-way switching value acquisition device ARTU-K8, and the negative terminal N of the auxiliary power supply inside the three-phase digital multifunctional measurement and control meter PMC-33M is connected to the 8-way switching value acquisition device ARTU- Power negative terminal 1 on K8, RS-485 communication terminal D includes two wiring terminals D+ and D-, RS-485 communication terminal D+ is connected to the second communication terminal B on ARTU-K8, RS-485 communication terminal -485 communication terminal D- is connected to the first communication terminal A on the 8-way switch value acquisition device ARTU-K8, data exchange is carried out through the RS485 bus, and the state of the input signal is reflected in real time. The first communication terminal and the second communication terminal adopt high-speed Optocoupler isolation and protection circuit can prevent common mode or differential mode voltage interference;

[0026] The control switch on the 8-way switch value acquisition device ARTU-K8 includes six terminal blocks 4, 5, 6, 7, 8 and 9. Terminal 4 controls the on or off of the first input circuit breaker QF1. Terminals 5 Control the on or off of the second input circuit breaker QF2, the terminal 6 controls the on or off of the third input circuit breaker QF3, and the terminal 7 controls the on or off of the fourth input circuit breaker QF4, wiring Terminal 8 controls the on or off of the output circuit breaker QF, and terminal 9 controls the on or off of the surge protector SPD; the 8-channel switch value acquisition device ARTU-K8 can simultaneously collect 8 channels of active contacts or passives The switch signal of the contact, and adopts the photoelectric isolation technology to realize the electrical isolation of the input and output.

[0027] Compared with the prior art, the technical scheme of the present invention has the following advantages: the present invention uses a three-phase digital multi-function measurement and control meter to directly access signals from current transformers and voltage transformers, and perform real-time basic information on three-phase lines. Measure and record, and then connect to 8-channel switching value acquisition device, 8-channel switching value acquisition device and three-phase digital multi-function measurement and control meter for data exchange through RS-485 bus, real-time reflection of input signal status, 8-channel switching value acquisition device Adopt photoelectric isolation technology to realize electrical isolation of input and output, and protect the life safety of staff.

[0028] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principles of the present invention, several improvements and modifications can be made. These improvements and modifications It should also be regarded as the protection scope of the present invention.